CN102890093B - Machine vision detecting device of surface quality of master cylinder piston of automobile brake - Google Patents

Machine vision detecting device of surface quality of master cylinder piston of automobile brake Download PDF

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Publication number
CN102890093B
CN102890093B CN201210348279.3A CN201210348279A CN102890093B CN 102890093 B CN102890093 B CN 102890093B CN 201210348279 A CN201210348279 A CN 201210348279A CN 102890093 B CN102890093 B CN 102890093B
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China
Prior art keywords
light source
image
master cylinder
cylinder piston
detection
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Expired - Fee Related
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CN201210348279.3A
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CN102890093A (en
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许黎明
罗睿
杨子琦
查体建
解斌
胡德金
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Abstract

The invention discloses a machine vision detecting device of surface quality of a master cylinder piston of an automobile brake. The machine vision detecting device mainly consists of an optical imaging device, a mechanical transmission device and an image processing device. According to the machine vision detecting device, surface quality defects of the piston can be rapidly detected automatically, and each workpiece is detected within 3-4s in average; common defects are classified; motion control and integrated image collection and analysis are realized; the device can realize real-time recording of measuring data and management of a database, and can trace back to historical measuring data; a whole set of controlling and driving system is provided to finish dynamic collection of a piston surface image in a rotating process of the workpiece; and a whole set of detecting and controlling software is provided to realize real-time analysis of the image which is dynamically collected, and to provide a result of detecting the surface quality.

Description

Braking automobile master cylinder piston surface quality machine vision detection device
Technical field
What the present invention relates to is a kind of device of part machined surface quality detection technique field, and specifically, what relate to is a kind of braking automobile master cylinder piston surface quality machine vision detection device.
Background technology
Brake master cylinder piston is very important auto parts, concerns the quality of automobile and the life security of the personnel of riding.Because brake master cylinder piston output is very large, and the load mould on surface, to scratch its size, the degree of depth and distributing position be all random, current most of enterprise, for the detection of automotive brake fluid cylinder surfaces quality, all relies on the eyes of people to observe the result of measurement, judges that whether brake master cylinder piston is qualified.These detection method labour intensity are large, need constantly adjustment observation angle and light intensity, testing staff easily judges by accident because of tired, experience dependence is strong, production efficiency is low, quality can not get good guarantee, and it is very significant for therefore researching and developing the system that a set of dependence machine vision carries out surface quality detection.
Through finding the literature search of prior art, Chinese patent literature CN101221134A, describe one " method of detecting tiny bearing surface defect by computer vision technology and device thereof ", this technology utilizes cold light source to make light vertical irradiation bearing face by telecentric lens, by sensor control figure camera shooting bearing face image.But this pick-up unit can only detection plane piece surface.
Also find in retrieval, Chinese patent literature CN101799431A, describe " in high-speed production lines the machine vision on-line detection method of cover quality and equipment ", it is characterized in that: generate on line in robotization, to the cover detected be needed to be separated into single cover, single cover moves on conveyer; When cover moves to the detection station of conveyer, imaging system is to cover high speed imaging; The cover image delivery industry computing machine obtained also is processed by industrial computer, carries out quality testing to multiple surveyed area, produces Quality estimation signal; According to testing result, be positioned at the taking-out device that conveyer picks out station and substandard product is picked out; Specification product continue motion on conveyer, export in an orderly manner after apparatus for shaping.This patented technology weak point is: because detected cover can not rotate on conveyer, therefore at every turn a part of image can only be obtained to cover high speed imaging, need to carry out quality testing at the diverse location of travelling belt to multiple surveyed area, inspection can not be completed at same station.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of machine vision quality detecting system is provided, automatically can detect brake master cylinder piston surface quality defect in fast and stable ground, and complete product sorting according to testing result, realize motion control and image acquisition, analysis integration.
The present invention is achieved by the following technical solutions, the present invention includes: regulator cubicle, startup and stop button, horizontal stand, shading protective cover, optical imaging device, mechanical driving device, image processing apparatus and worktable.Wherein: regulator cubicle is positioned at the left side of worktable; startup and stop button are installed on the side near regulator cubicle; shading protective cover hinges fixing schedules on worktable; optical imaging device and mechanical driving device are fixed on horizontal stand by securing member, and horizontal stand is fixing on the table by securing member again.Master cylinder piston to be detected is driven to rotate after mechanical driving device starts, optical imaging device carries out master cylinder piston image acquisition, the dynamic acquisition completing multiple image in the process of a week is rotated at master cylinder piston, and pass to image processing apparatus and carry out real-time analysis detection, and show the testing result of piston face quality over the display, provide the defect type of faulty goods, complete the sorting of product.
Described optical imaging device, comprising: line slideway, digital camera slide block, XY axle digital camera adjusting seat, Z axis digital camera adjusting seat, camera connect block, industrial digital camera, zoom lens, light source guide rod, upper light source position set collar, upper light source pose adjustment frame, upper LED light source, lower light source position set collar, lower light source pose adjustment frame, lower LED light source, light source guide rod seat and light source slide block.Wherein: zoom lens is connected with industrial digital camera by camera lens bayonet socket, industrial digital camera securing member connects block by camera and is arranged in Z axis digital camera adjusting seat, Z axis digital camera adjusting seat is fixed in XY axle digital camera adjusting seat, and XY axle digital camera adjusting seat is connected on line slideway by digital camera slide block; Upper and lower two LED light sources are arranged on upper and lower two cover light source pose adjustment framves respectively, and by upper and lower light source position set collar, be fixed on the appropriate location on light source guide rod, light source guide rod is fixed in light source guide rod seat, and light source guide rod seat is connected on line slideway by light source slide block.
Described mechanical driving device, comprising: mechanical gear, motor in synchrony belt wheel, drive motor, synchronous cog belt, transmission shaft, upper ball cover, upper driving bearing, underdrive bearing, lower ball cover and transmission shaft synchronous pulley.Wherein: drive motor is fixed in the motor slot of mechanical gear by securing member; Upper driving bearing, underdrive bearing are through at transmission shaft upper/lower terminal, and are fixed in the bearing groove of mechanical gear by upper and lower bearing cap; Motor in synchrony belt wheel is connected by synchronous cog belt with transmission shaft synchronous pulley, and is separately fixed on drive motor and transmission shaft; Overall mechanical gear is positioned on worktable by securing member.
Described image processing apparatus, comprising: for computing machine and the image processing software part of image procossing.Wherein: software section comprises HMI interactive software part, control and bitcom part and image detection software part.HMI interactive software part comprises parameter initialization setting, testing calibration, the display of detected image and testing result display, and detection system state shows, alarm indication, manual operation, automatic operation, data storage, statistics and report capability; Control and bitcom part comprise the PLC communication program based on bus, detection system auto-action Row control, detection system manual operation action control, and image detects the control running and stop; Image processing software part comprises image timing acquiring program, image enhaucament, low-pass filtering and smoothing denoising program, image binaryzation handling procedure, image outline extraction program, open feature Model match program, the real-time display program of image.
For ensureing the effective of vision-based detection, in the timing of device integral installation, the center line of optical imaging device line slideway used needs and the center transmission shaft line of mechanical driving device intersects; Meanwhile, need the model specification according to different batches master cylinder piston to be detected, select the corresponding interchangeable web member of detection workpiece, interchangeable web member is installed on the top of transmission shaft.
When the present invention works, first, according to center and the profile size of master cylinder piston to be detected, the height of adjustment zoom lens, the distance of adjustment camera lens master cylinder piston relatively to be detected, and lens fine-tuning focal length, to guarantee that imaging is complete clear.Then, adjust position and attitude and the intensity of light source of upper and lower LED light source, guarantee that angle of incident light is suitable for, uniform intensity appropriateness.Then, after building shading protective cover, the green start button on worktable can be pressed, enter vision-based detection link.After startup, the drive motor of mechanical driving device starts to rotate, and drives transmission shaft synchronous pulley to rotate by motor in synchrony belt wheel and synchronous cog belt, thus drives transmission shaft and master cylinder piston to be detected above thereof to rotate.Simultaneously, optical imaging device carries out image acquisition, the dynamic acquisition completing multiple image in the process of a week is rotated at master cylinder piston, and pass to image processing apparatus and carry out real-time analysis, show the testing result of piston face quality over the display, provide the defect type of faulty goods, complete the sorting of product.Finally this master cylinder piston is taken off, the master cylinder piston of next same model is installed, again can press start button and start to detect.
Compared with prior art, the present invention has following beneficial effect:
1, automatically complete the quick detection of piston face mass defect, the average detected time of each workpiece can complete in 3 to 4 seconds;
2, can classify to common deficiency;
3, motion control and image acquisition, analysis integration;
4, measurement data real time record, data base administration, measuring historical data can review;
5, possess a whole set of to control and drive system, the dynamic acquisition of piston face image can be completed in workpiece rotation process;
6, possess the detection and control software of complete set, the real-time analysis of dynamic acquisition image can be completed, provide the testing result of surface quality.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is general illustration of the present invention.
Fig. 2 is the front view of optical imaging device of the present invention and mechanical driving device.
Fig. 3 is the cut-open view of mechanical driving device of the present invention.
In figure:
Regulator cubicle 1, startup and stop button 2, horizontal stand 3, shading protective cover 4, optical imaging device 5, mechanical driving device 6, pattern process computer display 7, pattern process computer main frame 8, worktable 9;
Line slideway 10, digital camera slide block 11, XY axle digital camera adjusting seat 12, Z axis digital camera adjusting seat 13, camera connect block 14, industrial digital camera 15, zoom lens 16, light source guide rod 17, upper light source position set collar 18, upper light source pose adjustment frame 19, upper LED light source 20, master cylinder piston to be detected 21, lower light source position set collar 22, lower light source pose adjustment frame 23, lower LED light source 24, light source guide rod seat 25, light source slide block 26, mechanical driving device 27;
Mechanical gear 28, motor in synchrony belt wheel 29, drive motor 30, synchronous cog belt 31, the interchangeable web member 32 of detection workpiece, transmission shaft 33, upper ball cover 34, upper driving bearing 35, underdrive bearing 36, lower ball cover 37, transmission shaft synchronous pulley 38.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
As shown in Figure 1; the present embodiment provides a kind of braking automobile master cylinder piston surface quality Machine Vision Detection to equip, and comprises regulator cubicle 1, starts and stop button 2, horizontal stand 3, shading protective cover 4, optical imaging device 5, mechanical driving device 6, pattern process computer display 7, pattern process computer main frame 8 and worktable 9.Wherein: regulator cubicle 1 is positioned at the left side of worktable 9; startup and stop button 2 are installed on the side near regulator cubicle 1; shading protective cover 4 hinges fixing schedules on worktable 9; optical imaging device 5 and mechanical driving device 6 are fixed on horizontal stand 3 by securing member, and horizontal stand 3 is fixed on worktable 9 by securing member again.Pattern process computer display 7 arranges on the table, and pattern process computer main frame 8 is arranged on below worktable 9.
As shown in Figure 2, described optical imaging device 5 comprises: line slideway 10, digital camera slide block 11, XY axle digital camera adjusting seat 12, Z axis digital camera adjusting seat 13, camera connect block 14, industrial digital camera 15, zoom lens 16, light source guide rod 17, upper light source position set collar 18, upper light source pose adjustment frame 19, upper LED light source 20, lower light source position set collar 22, lower light source pose adjustment frame 23, lower LED light source 24, light source guide rod seat 25, light source slide block 26.Wherein: zoom lens 16 is connected with industrial digital camera 15 by camera lens bayonet socket, industrial digital camera 15 connects block 14 with securing member by camera and is arranged in Z axis digital camera adjusting seat 13, Z axis digital camera adjusting seat 13 is fixed on 12, XY axle digital camera adjusting seats 12 in XY axle digital camera adjusting seat and is connected on line slideway 10 by digital camera slide block 11; Upper LED light source 20 and lower LED light source 24 are arranged on light source pose adjustment frame 19 and lower light source pose adjustment frame 23 respectively, and respectively by upper light source position set collar 18 and lower light source position set collar 22, be fixed on the appropriate location on light source guide rod 17, light source guide rod 17 is fixed in light source guide rod seat 25 by holding screw, and light source guide rod seat 25 is connected on line slideway 10 by light source slide block 26.
As shown in Figure 3, described mechanical driving device 6, comprising: mechanical gear 28, motor in synchrony belt wheel 29, drive motor 30, synchronous cog belt 31, transmission shaft 33, upper ball cover 34, upper driving bearing 35, underdrive bearing 36, lower ball cover 37 and transmission shaft synchronous pulley 38.Wherein: drive motor 30, by securing member, is fixed in the motor slot of mechanical gear 28; Upper driving bearing 35 and underdrive bearing 36 are through at transmission shaft 33 upper/lower terminal respectively, and are fixed in the bearing groove of mechanical gear 28 by upper ball cover 34 and lower ball cover 37; Motor in synchrony belt wheel 29 is connected by synchronous cog belt 31 with transmission shaft synchronous pulley 38, and is separately fixed on drive motor 30 and transmission shaft 33; Overall mechanical gear 28 is positioned on worktable 9 by securing member.
For ensureing the effective of vision-based detection, in the timing of device integral installation, the center line of optical imaging device 5 line slideway 10 used needs and transmission shaft 33 center line of mechanical driving device 6 intersects.
The size of the master cylinder piston to be detected 21 of different model specification is different, need design and produce the corresponding interchangeable web member 32 of detection workpiece.Detecting the interchangeable web member of workpiece 32 is multidiameters with the level, and upper end diameter adopts clearance fit with needing the workpiece diameter to be detected mated, and the top internal diameter of lower end diameter and transmission shaft 33 adopts transition fit.During work, the interchangeable web member 32 of coupling is installed on the top of transmission shaft 33, then master cylinder piston 21 to be detected is arranged on the upper end detecting the interchangeable web member 32 of workpiece.
Described image processing apparatus, comprising: for computing machine and the image processing software part of image procossing.Wherein: software section comprises HMI interactive software part, control and bitcom part and image detection software part.HMI interactive software part comprises parameter initialization setting, testing calibration, the display of detected image and testing result display, and detection system state shows, alarm indication, manual operation, automatic operation, data storage, statistics and report capability; Control and bitcom part comprise the PLC communication program based on bus, detection system auto-action Row control, detection system manual operation action control, and image detects the control running and stop; Image processing software part comprises image timing acquiring program, image enhaucament, low-pass filtering and smoothing denoising program, image binaryzation handling procedure, image outline extraction program, open feature Model match program, the real-time display program of image.Wherein, image timing acquiring program collection 6 per second width Image Saving, in 6 buffer memorys, waits to be read.Image in buffer memory is successively by strengthening process, and low-pass filtering, smoothing denoising carries out Image semantic classification.By adjusting suitable threshold value, then binary conversion treatment is carried out to pretreated image.Then the edge detecting technology based on Roberts operator is utilized to carry out image outline extraction.Then in the contour images extracted, carry out multiple feature Model match, model number depends on that user selects.Finally the image after process and matching result are carried out integrating and showing in real time.The image processing techniques that this software adopts is existing mature technology, repeats no more.
During the present embodiment work, first, according to center and the profile size of master cylinder piston 21 to be detected, the height of adjustment zoom lens 16, the distance of adjustment camera lens master cylinder piston 21 relatively to be detected, and lens fine-tuning focal length, to guarantee that imaging is complete clear.Then, the position and attitude of upper LED light source 20 and lower LED light source 24 and the intensity of light source, guarantee that angle of incident light is suitable for, uniform intensity appropriateness.Then, after building shading protective cover 4, the green start button 2 on worktable can be pressed, enter vision-based detection link.After startup, the drive motor 30 of mechanical driving device 6 starts to rotate, and drives transmission shaft synchronous pulley 38 to rotate by motor in synchrony belt wheel 29 and synchronous cog belt 31, thus drives transmission shaft 33 and master cylinder piston to be detected 21 above thereof to rotate.Meanwhile, optical imaging device 5 carries out image acquisition, and passes to image processing apparatus analysis, and display analysis measurement result on pattern process computer display 7, completes the sorting of product.Finally current master cylinder piston 21 to be detected is taken off, the master cylinder piston of next same model is installed, again can press start button 2 and start to detect.
The present invention can complete the quick detection of piston face mass defect automatically, and the average detected time of each workpiece can complete in 3 to 4 seconds; Can classify to common deficiency; Realize motion control and image acquisition, analysis integration; Realize measurement data real time record, data base administration, measuring historical data can review; Possess a whole set of to control and drive system, the dynamic acquisition of piston face image can be completed in workpiece rotation process; Possess the detection and control software of complete set, the real-time analysis of dynamic acquisition image can be completed, provide the testing result of surface quality.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (7)

1. a braking automobile master cylinder piston surface quality machine vision detection device, comprise: regulator cubicle, startup and stop button, horizontal stand, shading protective cover, optical imaging device, mechanical driving device, image processing apparatus and worktable, it is characterized in that: regulator cubicle is positioned at the left side of worktable, startup and stop button are installed on the side near regulator cubicle, shading protective cover hinges fixing schedules on worktable, optical imaging device and mechanical driving device are fixed on horizontal stand by securing member, and horizontal stand is fixing on the table by securing member again; Master cylinder piston to be detected is driven to rotate after mechanical driving device starts, optical imaging device carries out master cylinder piston image acquisition, the dynamic acquisition completing multiple image in the process of a week is rotated at master cylinder piston, and pass to image processing apparatus and carry out real-time analysis detection, and show the testing result of piston face quality over the display, provide the defect type of faulty goods, complete the sorting of product;
Described optical imaging device, comprising: line slideway, digital camera slide block, XY axle digital camera adjusting seat, Z axis digital camera adjusting seat, camera connect block, industrial digital camera, zoom lens, light source guide rod, upper light source position set collar, upper light source pose adjustment frame, upper LED light source, lower light source position set collar, lower light source pose adjustment frame, lower LED light source, light source guide rod seat and light source slide block; Wherein: zoom lens is connected with industrial digital camera by camera lens bayonet socket, industrial digital camera securing member connects block by camera and is arranged in Z axis digital camera adjusting seat, Z axis digital camera adjusting seat is fixed in XY axle digital camera adjusting seat, and XY axle digital camera adjusting seat is connected on line slideway by digital camera slide block; Upper and lower two LED light sources are arranged on upper and lower two cover light source pose adjustment framves respectively, and by upper and lower light source position set collar, be fixed on the appropriate location on light source guide rod, light source guide rod is fixed in light source guide rod seat, and light source guide rod seat is connected on line slideway by light source slide block;
Described mechanical driving device, comprising: mechanical gear, motor in synchrony belt wheel, drive motor, synchronous cog belt, transmission shaft, upper ball cover, upper driving bearing, underdrive bearing, lower ball cover and transmission shaft synchronous pulley; Wherein: drive motor is fixed in the motor slot of mechanical gear by securing member; Upper driving bearing, underdrive bearing are through at transmission shaft upper/lower terminal, and are fixed in the bearing groove of mechanical gear by upper and lower bearing cap; Motor in synchrony belt wheel is connected by synchronous cog belt with transmission shaft synchronous pulley, and is separately fixed on drive motor and transmission shaft; Overall mechanical gear is positioned on worktable by securing member;
In the timing of device integral installation, the center line of optical imaging device line slideway used needs and the center transmission shaft line of mechanical driving device intersects, to ensure vision-based detection imaging accurate and effective.
2. braking automobile master cylinder piston surface quality machine vision detection device according to claim 1, it is characterized in that, described image processing apparatus, comprising: for computing machine and the image processing software part of image procossing; Wherein: software section comprises HMI interactive software part, control and bitcom part and image detection software part, HMI interactive software part comprises parameter initialization setting, testing calibration, the display of detected image and testing result display, detection system state shows, alarm indication, manual operation, automatic operation, data storage, statistics and report capability; Control and bitcom part comprise the communication program based on bus, detection system auto-action Row control, detection system manual operation action control, the control that image detects; Image detection software part comprises image acquisition procedure, image filtering and pre-service, the real-time amplification of image matching algorithm and image and display.
3. braking automobile master cylinder piston surface quality machine vision detection device according to claim 1, it is characterized in that, the top of described transmission shaft is provided with detects the interchangeable web member of workpiece, the interchangeable web member of described detection workpiece is selected according to the model specification of different batches master cylinder piston to be detected, detecting the interchangeable web member of workpiece is multidiameter with the level, upper end diameter adopts clearance fit with needing the workpiece diameter to be detected mated, and the top internal diameter of lower end diameter and transmission shaft adopts transition fit.
4. braking automobile master cylinder piston surface quality machine vision detection device according to claim 1, it is characterized in that, according to center and the profile size of master cylinder piston to be detected, the height of adjustment zoom lens, the distance of adjustment camera lens master cylinder piston relatively to be detected, and lens fine-tuning focal length, to guarantee that imaging is complete clear.
5. braking automobile master cylinder piston surface quality machine vision detection device according to claim 1, it is characterized in that, according to the position of master cylinder piston to be detected and the light of workplace, adjust position and attitude and the intensity of light source of upper and lower LED light source, guarantee that angle of incident light is suitable for, uniform intensity appropriateness.
6. braking automobile master cylinder piston surface quality machine vision detection device according to claim 1, is characterized in that, possesses a whole set of and controls and drive system, can complete the dynamic acquisition of piston face image in workpiece rotation process.
7. braking automobile master cylinder piston surface quality machine vision detection device according to claim 1, it is characterized in that, described device possesses the detection and control software of complete set, can complete the real-time analysis of dynamic acquisition image, provides the testing result of surface quality.
CN201210348279.3A 2012-09-18 2012-09-18 Machine vision detecting device of surface quality of master cylinder piston of automobile brake Expired - Fee Related CN102890093B (en)

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